Electronic Telegram No. 2031

Central Bureau for Astronomical Telegrams
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138,
U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://www.cfa.harvard.edu/iau/cbat.html

SUPERNOVA 2009ll IN ESO 122-4
J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, P. Gonzalez, P. Lopez, S. Silva, G. Folatelli, D. Iturra, R. Cartier, F. Forster, S. Marchi, and A. Rojas, Universidad de Chile; G. Pignata, Universidad Andres Bello; B. Conuel, Wesleyan University; and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project, report the discovery of an apparent supernova (mag approximately 18.4 +/- 0.4) on an unfiltered image taken on Nov. 12.32 UT with the 0.41-m 'PROMPT 5' telescope located at Cerro Tololo. The new object is located at R.A. = 6h42m12s.52 +/- 0".1, Decl. = -61°04'27".2 +/- 0".1 (equinox 2000.0), which is about 4".6 west and 12".2 south of the center of the galaxy ESO 122-4. Nothing is visible at this location on an R-band image taken on 1988 with the European Southern Observatory 1-m Schmidt telescope (limiting mag 19.0). Additional approximate unfiltered CCD magnitudes for 2009ll: 2008 Sept. 1.32-2009 Nov. 3.31, [20.5 (thirty-eight 40-s stacked archival images); 2009 Jan. 31.10, [19.0; Oct. 8.36, [18.5; Nov. 8.34, 18.7; 13.11, 18.3 (seven 40-s exposures); 19.10, 18.2 (thirty-one 40-s images).

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

2009 November 19
(C) Copyright 2009 CBAT
(CBET 2031)
Daniel W. E. Green